source: branches/2922-DataCompletenessChartPerf/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/PatternMatching/Backreference.cs

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// 
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// 
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using System;
using System.Linq;

namespace ICSharpCode.NRefactory.PatternMatching
{
  /// <summary>
  /// Matches the last entry in the specified named group.
  /// </summary>
  public class Backreference : Pattern
  {
    readonly string referencedGroupName;
    
    public string ReferencedGroupName {
      get { return referencedGroupName; }
    }
    
    public Backreference(string referencedGroupName)
    {
      if (referencedGroupName == null)
        throw new ArgumentNullException("referencedGroupName");
      this.referencedGroupName = referencedGroupName;
    }
    
    public override bool DoMatch(INode other, Match match)
    {
      var last = match.Get (referencedGroupName).Last ();
      if (last == null && other == null)
        return true;
      return last.IsMatch(other);
    }
  }
}